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MAX5419NETA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX5419NETA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers ______________________________________________________________________________________ 11 Message Format for Writing A write to the MAX5417/MAX5418/MAX5419 consists of the transmission of the device’s slave address with the 8th bit set to zero, followed by at least 1 byte of infor- mation (Figure 7). The 1st byte of information is the command byte. The bytes received after the command byte are the data bytes. The 1st data byte goes into the internal register of the MAX5417/MAX5418/MAX5419 as selected by the command byte (Figure 8). Command Byte Use the command byte to select the source and desti- nation of the wiper data (nonvolatile or volatile memory registers) and swap data between nonvolatile and volatile memory registers (see Table 2). Command Descriptions VREG: The data byte writes to the volatile memory reg- ister and the wiper position updates with the data in the volatile memory register. NVREG: The data byte writes to the nonvolatile memo- ry register. The wiper position is unchanged. NVREGxVREG: Data transfers from the nonvolatile memory register to the volatile memory register (wiper position updates). VREGxNVREG: Data transfers from the volatile memo- ry register into the nonvolatile memory register. A 0 SLAVE ADDRESS CONTROL BYTE DATA BYTE ACKNOWLEDGE FROM MAX5417/MAX5418/MAX5419 NOP/W 1 BYTE ACKNOWLEDGE FROM MAX5417/MAX5418/MAX5419 ACKNOWLEDGE FROM MAX5417/MAX5418/MAX5419 D15 D14 D13 D12 D11 D10 D9 D8 D1 D0 D3 D2 D5 D4 D7 D6 HOW CONTROL BYTE AND DATA BYTE MAP INTO MAX5417/MAX5418/MAX5419 REGISTERS S A A P S A 0 SLAVE ADDRESS CONTROL BYTE ACKNOWLEDGE FROM MAX5417/MAX5418/MAX5419 NOP/W ACKNOWLEDGE FROM MAX5417/MAX5418/MAX5419 D15 D14 D13 D12 D11 D10 D9 D8 CONTROL BYTE IS STORED ON RECEIPT OF STOP CONDITION AP Figure 7. Command Byte Received Figure 8. Command and Single Data Byte Received |
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